The Quietest Place on Earth
This is the quietest place on Earth. It’s so quiet that you can hear the sounds of your own heart and stomach. The average person can only spend about 30 minutes in this room before they start hallucinating.
According to Guinness World Records, 2005, Orfield Laboratory’s anechoic chamber (pictured above) is "The quietest place on Earth" measured at −9.4 decibels. However, the University of Salford has a number of anechoic chambers, one of which is unofficially the quietest in the world having a measurement of −12.4 decibels.
The purpose of an anechoic chamber is for testing the response of loudspeakers or microphones because the room doesn’t affect the acoustic measurements. It is also the best place for virtual acoustics - generating auralizations of concert halls, city streets and other spaces.